For the longest time, my entry was entirely composed of the first eighty words. From 'the boy shivered' to 'joined by the ashes from below,' I personally felt like I had created the perfect beginning. The issue, however, was that I had no idea what to do thereafter.
After a couple weeks, I decided I'd try to just write whatever came to mind. I developed two or three full drafts, and then selected the best. Still, I lacked an ending. So, I pretty much just threw in what was simplest. This made it rather abrupt, as you said, Angel, and for that, I am sorry. One of these times, I need to actually think of a compelling ending. (thinks back to previous entries)
As for the sin, I chose Sloth. I wanted it to be subtle, and I also wanted to choose a variation of it that many no longer consider. Originally, Sloth was more predominately based around not doing what one should do, instead of just not doing anything. As in, stopping evil or whatever. I guess I either made it too subtle, or should've chosen a more straightforward version of the sin.